Device for winding-up material webs

ABSTRACT

A winding device includes a support roller receiving strips of a material web to be wound up on two coil rollers mounted on respective winding supports flanking the support roller and movable parallel to an axis of the support roller along with respective electric motors actuating respective drive heads and getting cooled by respective flexible carriers movable along with the winding supports.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase of PCT/EP91/00604 filed Mar. 28,1991 and based upon German National Application P40 14512.3 of May 7,1990, under the International Convention.

FIELD OF THE INVENTION

The invention concerns a device for the winding-up of material webs,especially paper webs or cardboard (paper board) webs on winding tubes.

BACKGROUND OF THE INVENTION

From the article "Roller Cutters and Roll Machines For the PaperEquipment, Part 3" in COATING 1/89, pages 8-12, a winding up device ofthis type is known which has a driven support roller and windingstations arranged on both sides of the support roller. Each windingstation is comprised of two swingable support arms, each of which isequipped with a respective hydraulic winding drive. The two hydraulicmotors of a winding station are connected in parallel and are fed from ahydraulic variable displacement pump.

Hydraulic drives have relatively small sizes for high powers, but it hasbeen found that their use in winding machines brings disadvantages; thatis outside of the winding machine large hydraulic installations arerequired and the adjustment of the winding station in the case of sizechanges presents problems. Because of the requisite high pressure (forexample 300 bar) in the feed piping, these are very stiff and can bebrought into the required new positions in a format change only withdifficulty. In addition the requisite control is very complex withhydraulic drives.

OBJECT OF THE INVENTION

The object of the present invention is to provide a winding machinehaving the coiling stations adjusted in a problem free manner todifferent formats, especially to very small formats.

SUMMARY OF THE INVENTION

Liquid cooled electric motors provide the required acceleration powerand braking power with relatively small structural size. The size of themotor is of significance since the support elements (for example rollingbrackets) with the motors must be brought to the smallest possiblespacing from one another for small format widths. Indeed, the liquidcooled motors require supply piping for the cooled liquid, but therequisite pressure in the piping is significantly less than that for thehydraulic in the supply piping of hydraulic drives. It has been shownthat a coolant liquid pressure of 0.1 bar suffices. Because of the lowpressure, the supply piping is highly bendable and can have its positionadjusted without problems upon a format change.

The dependent claims recite especially advantageous embodiments of theinvention. The use of a polyphase [three phase] alternating currentasynchronous motor according to one of the embodiments enables anespecially small motor volume with high power since, with these motors,the heat generation is effected primarily in the stator coil and controlvia a frequency converter is least expensive.

BRIEF DESCRIPTION OF THE DRAWING

The above and other objects, features and advantages of the inventionwill become more readily apparent form the following description,reference being made to the accompanying highly diagrammatic drawing inwhich:

FIG. 1 is a side elevational view of a support roll coiling machineaccording to the invention.

SPECIFIC DESCRIPTION

The material web 1, drawn from a supply roll not illustrated, in thepresent example a paper web, is fed via guide rollers 2-7 from aboveonto the driven support roller 8. To both sides of the support roller 8,coiling stations 9 and 10 are arranged and each is comprised of twosupport elements displaceable parallel to the support roller axis. Inthe present example, the support elements are coiling brackets 11, 12although the use of swingable support arms is possible. Each windingbracket 11, 12 carries on its upper side a slide 13, 14 displaceableradially to the support roller 8. A drive head 15, 16 with its rotarydrive 17, 18 is fastened. The drive heads 15, 16 are insertable into thecoiling sleeves of the coiling rolls 19, 20 to hold and drive them.

Polyphase alternating current asynchronous motors are used as rotarydrive 17, 18, the motors having stator windings cooled with water fromstation 300 by means of flexible carriers 400. A cooling with oil isalso possible. For this purpose the housings of the motor 17, 18 areequipped with circulating cooling passages for the cooling liquid. Sothat the winding brackets 11, 12 can be displaced inwardly as closetogether as is possible for small formats. The motors 17, 18 have theirlongitudinal orientations mounted in the web travel direction and areconnected via an angle drive with the drive head 15, 16. The drives areeach flanged on the motor 17, 18, whereby each flange also has coolingpassages. The flange region can thus be cooled in a manner so enhancedthat heat developed in the drive will also be carried off.

A control arrangement 100 controls or regulates the coil hardness of thecoiled rolls 19, 20 via the torque of the motor 17, 18. For thepolyphase asynchronous motors of the example the torque control orregulation is effected via a frequency converter or transformer 200.

Instead of polyphase asynchronous motors, direct current motors or servomotors are usable whose stator coils are cooled with water or oil.Direct current motors however require expensive maintenance because ofthe wear on carbon brushes and with servo motors expensive controlconcepts are required. The cooling passages of motor 17, 18 areconnected with supply tubing for cooling liquid 400 which is suppliedfrom a common cooling unit 300 outside the coiling machine. The supplytubing on each side of the coiling machine can be gathered into trailingbundles because of the low pressure in the tubing (0.1 bar) which makesthe tubing very bendable so that it can be arranged in a space savingmanner and can move in a problem free fashion during a format change.Furthermore, the danger of sealing breakdown is minimal at the lowpressure.

Above the support roller 8 in a region between the guide rolls 6 and 7,a longitudinal slitting device 21 is arranged and comprises a pluralityof circular blade pairs 21.1, 21.2 which are displaceable transverselyto the travel direction of the web for the different format widths ofthe individual strips to be cut. Above the support roller 8 is a roller22 on a lateral pivot lever 23 bearing upon the support roll 8 andpressable thereagainst in a region thereof around which the web 1 islooped. The roll 22 serves, together with the support roll 8 to releasethe tension on the web ahead of the coiling stations 9 and 10. Thetension downstream of the clamping point formed by the roller 22 and theroller 8 is controlled via the torque applied to the motors 17, 18 by afrequency converter to the requisite value for the desired coilinghardness. The tension for each of the coiled rolls 19, 20 can thus becontrolled individually via the motor 17, 18 so that each of the coilingstations 9, 10 can be operated as an independent, self-standing coilingmachine.

Preferably the coiling machine is used for producing rolls of largediameter (for example 1.5 m) of HWC-papers (high weight coated). Thesepapers are sensitive to marking so that the line forces at the supportroller 8 should be held to a minimum. Since the tension required forcoiling the web 1 is applied by the drives 17, 18, the line forces withwhich the wound rolls 19, 20 press against the support roller 8 duringthe coiling can be held to values less than 30 N/m. The line forceshowever must be at least 10 N/m so that no air is wound into the coiland wound coiled rolls can be obtained even with profile fluctuations inthe web 1.

I claim:
 1. A device for winding up of material webs, especially paperwebs or cardboard webs, transported along a web path, the devicecomprising:slitting means along a web path for subdividing the web intoindividual strips; a driven support roller downstream of the slittingmeans rotatable about a support axis and receiving the strips; and apair of winding stations spaced radially from the support axis toopposite sides thereof for withdrawing the strips from the supportroller, each of the winding stations comprising:a plurality of windingbrackets and movable radially toward and away from the support axis anddisplaceable parallel to the axis for coiling strips of differentformat, a respective angle drive mounted on each support element anddisplaceable therewith for rotatably driving a respective coiling rollwinding up a respective strip, a respective electric motor connectedwith each angle drive and inclined to a horizontal, each electric motorbeing provided with a respective housing and each angle drive beingprovided with respective flanges for connecting with the respectivemotor, each motor being displaceable with the respective support elementactuating the angle drive, and respective flexible cooling meansproviding a cooling medium for cooling the electric motor enablingshifting thereof along with a respective one of the support elements,each cooling means including: bendable supply tubing conveying coolingliquid, circulating cooling passages formed in each housing, and coolingpassages formed in each flange, so that the heat developed in each motorand each angle drive is carried off upon circulating of cooling liquid.2. The device defined in claim 1, further comprising control means forcontrolling a torque of each of the electric motors thereby regulating acoil hardness of a respective coil roll.
 3. The device defined in claim2 wherein each motor is a polyphase asynchronous motor having a statorcoil cooled with a liquid cooling medium selected from the groupconsisting of water and oil.
 4. The device defined in claim 2 whereinthe control means is a frequency converter controlling the electricmotors.
 5. The device defined in claim 1 wherein the motor is a directcurrent motor whose stator winding is cooled with a liquid coolingmedium selected from the group consisting of water and oil.